Hello, in my game I have many moving horizontal platforms
If the player stands on one, he does not move. How would I get him to move with the platforms?
Here is the code for the player:
This is the code for the platforms:
import greenfoot.*;
/**
* This is the main player that the user will control
*/
public class Player extends Actor
{
private int vSpeed = 0;
private int acceleration = 1;
private boolean jumping;
private int jumpStrength = 16;
private int speed = 3;
private int score = 0;
private boolean hasCoin = false;
private boolean hasCoinFinal = false;
private int direction = 1; // 1 = right and -1 = left
int groundHeight = getImage().getHeight()/2;//How far it is from the middle of the actor to the bottom
int sideWidth = getImage().getWidth()/2; //How far from middle of actor to side
/**
* This shows the sprite images of the player moving left and right
*/
private GreenfootImage RNrun1 = new GreenfootImage("RNrun2.png");
private GreenfootImage RNrun2 = new GreenfootImage("RNrun3.png");
private GreenfootImage RNrun3 = new GreenfootImage("RNrun4.png");
private GreenfootImage RNrun4 = new GreenfootImage("RNrun5.png");
private GreenfootImage RNrun5 = new GreenfootImage("RNrun6.png");
private GreenfootImage RNrun1left = new GreenfootImage("RNrun2left.png");
private GreenfootImage RNrun2left = new GreenfootImage("RNrun3left.png");
private GreenfootImage RNrun3left = new GreenfootImage("RNrun4left.png");
private GreenfootImage RNrun4left = new GreenfootImage("RNrun5left.png");
private GreenfootImage RNrun5left = new GreenfootImage("RNrun6left.png");
int frame = 1;
int animationCounter = 0;
double gravity=0;
private int shootingCounter = 20; // Delay shooting
private int points = 0;
public void act()
{
checkKey();
platformAbove();
checkRightWalls();
checkLeftWalls();
checkFall();
grab();
if (shootingCounter > 0) shootingCounter--;
animationCounter++;
exit();
}
/**
* Checks to see if any key has been pressed
* If a key has been pressed, it does the corispoding action
*/
public void checkKey()
{
if(Greenfoot.isKeyDown("right"))
{
direction = 1;
moveRight();
}
if(Greenfoot.isKeyDown("d"))
{
direction = 1;
moveRight();
}
if(Greenfoot.isKeyDown("left"))
{
direction = -1;
moveLeft();
}
if(Greenfoot.isKeyDown("a"))
{
direction = -1;
moveLeft();
}
if(Greenfoot.isKeyDown("up") && jumping == false)
{
jump();
}
if(Greenfoot.isKeyDown("w") && jumping == false)
{
jump();
}
}
/**
* If the Right Arow key is pressed move the player right
*/
public void moveRight()
{
setLocation(getX()+speed, getY());
if(animationCounter % 5 == 0)
{
animateRight();
}
}
/**
* This loops through five images of the player moving right when the right arrow key is pressed
*/
public void animateRight()
{
if(frame == 1)
{
setImage(RNrun1);
}
else if(frame == 2)
{
setImage(RNrun2);
}
else if(frame == 3)
{
setImage(RNrun3);
}
else if(frame == 4)
{
setImage(RNrun4);
}
else if(frame == 5)
{
setImage(RNrun5);
frame = 1;
return;
}
frame++;
}
/**
* If the Left Arow key is pressed move the player left
*/
public void moveLeft()
{
setLocation(getX()-speed, getY());
if(animationCounter %5 == 0)
{
animateLeft();
}
}
/**
* This loops through five images of the player moving left when the left arrow key is pressed
*/
public void animateLeft()
{
if(frame == 1)
{
setImage(RNrun1left);
}
else if(frame == 2)
{
setImage(RNrun2left);
}
else if(frame == 3)
{
setImage(RNrun3left);
}
else if(frame == 4)
{
setImage(RNrun4left);
}
else if(frame == 5)
{
setImage(RNrun5left);
frame = 1;
return;
}
frame++;
}
/** Gets the height and width of the player sprite and sets the origin point to the center of the head
* Checks to see of there is an object above the player
*/
public boolean platformAbove()
{
int spriteHeight = getImage().getHeight();
int yDistance = (int)(spriteHeight/-2);
Actor ceiling = getOneObjectAtOffset(0, yDistance, Platform.class);
if(ceiling != null)
{
vSpeed = 1;
bopHead(ceiling);
return true;
}
else
{
return false;
}
}
/**
* Check to see if the player has reach the right edge of the world or an object
* If they have reached the right edge, stop the player from moving right
*/
public boolean checkRightWalls()
{
int spriteWidth = getImage().getWidth();
int xDistance = (int)(spriteWidth/2);
Actor rightWall = getOneObjectAtOffset(xDistance, 0, Platform.class);
if(rightWall == null)
{
return false;
}
else
{
stopByRightWall(rightWall);
return true;
}
}
public void stopByRightWall(Actor rightWall)
{
int wallWidth = rightWall.getImage().getWidth();
int newX = rightWall.getX() - (wallWidth + getImage().getWidth())/2;
setLocation(newX - 5, getY());
}
/**
* Check to see if the player has reach the left edge of the world or an object
* If they have reached the right edge, stop the player from moving left
*/
public boolean checkLeftWalls()
{
int spriteWidth = getImage().getWidth();
int xDistance = (int)(spriteWidth/-2);
Actor leftWall = getOneObjectAtOffset(xDistance, 0, Platform.class);
if(leftWall == null)
{
return false;
}
else
{
stopByLeftWall(leftWall);
return true;
}
}
public void stopByLeftWall(Actor leftWall)
{
int wallWidth = leftWall.getImage().getWidth();
int newX = leftWall.getX() + (wallWidth + getImage().getWidth())/2;
setLocation(newX + 5, getY());
}
/**
* If there is an object above the player, stop the player from jumping any higher than they are allowed to
* And fall back to the ground
*/
public void bopHead(Actor ceiling)
{
int ceilingHeight = ceiling.getImage().getHeight();
int newY = ceiling.getY() + (ceilingHeight + getImage().getHeight())/2;
setLocation(getX(), newY);
}
public void fall()
{
setLocation(getX(), getY() + vSpeed);
if(vSpeed <=9)
{
vSpeed = vSpeed + acceleration;
}
jumping = true;
}
/**
* Check to see if the player is on the ground
* If the player is on the ground, allow the Jumping action to take place
* If not on the ground, move the player to the ground
*/
public boolean onGround()
{
int spriteHeight = getImage().getHeight();
int yDistance = (int)(spriteHeight/2) + 5;
Actor ground = getOneObjectAtOffset(0, getImage().getHeight()/2, Platform.class);
if(ground == null)
{
jumping = true;
return false;
}
else
{
moveToGround(ground);
return true;
}
}
/**
* Sets the origin point of the player sprite to the center at the bottom
* And makes the player stand on top of the ground
*/
public void moveToGround(Actor ground)
{
int groundHeight = ground.getImage().getHeight();
int newY = ground.getY() - (groundHeight + getImage().getHeight())/2;
setLocation(getX(), newY);
jumping = false;
}
/**
* Check to see if the player is falling
* If the player is not falling, vSpeed is set to 0
* If player is falling, do the fall method
*/
public void checkFall()
{
if(onGround())
{
vSpeed = 0;
}
else
{
fall();
}
}
/**
* Allows the player to jump if Jumping is true
* Then calls the Fall method after the jumping method has played
*/
public void jump()
{
vSpeed = vSpeed - jumpStrength;
jumping = true;
fall();
}
/**
* Check to see if the player has collected the coin
* Add 10 points to the score
* Play the sound effect of Collecting a coin
*/
public void grab()
{
if (canSee(Coin.class) )
{
get(Coin.class);
hasCoin = true;
Greenfoot.playSound("Coin.wav");
}
if (canSee(CoinFinal.class) )
{
get(CoinFinal.class);
hasCoinFinal = true;
Greenfoot.playSound("Coin.wav");
}
}
/**
* Return true if we can see an object of class 'clss' right where we are.
* False if there is no such object here.
*/
public boolean canSee(Class clss)
{
Actor actor = getOneObjectAtOffset(0, 0, clss);
return actor != null;
}
public void get(Class clss)
{
Actor actor = getOneObjectAtOffset(0, 0, clss);
if(actor != null) {
getWorld().removeObject(actor);
}
}
/**
* If the player has collected the coin, Allow them to exit the level
* Play Sound effect of Level complete
* Start next level (If not on the last level
*/
public void exit()
{
if (canSee(PortalHill1.class) && hasCoin == true)
{
Greenfoot.setWorld(new HillLevel2());
}
if (canSee(PortalHill2.class) && hasCoin == true)
{
Greenfoot.setWorld(new HillLevel3());
}
if (canSee(PortalHill3.class) && hasCoin == true)
{
Greenfoot.setWorld(new DustLevel1());
}
if (canSee(PortalDust1.class) && hasCoin == true)
{
Greenfoot.setWorld(new DustLevel2());
}
if (canSee(PortalDust2.class) && hasCoin == true)
{
Greenfoot.setWorld(new DustLevel3());
}
if (canSee(PortalDust3.class) && hasCoin == true)
{
Greenfoot.setWorld(new SpaceLevel1());
}
if (canSee(PortalSpace1.class) && hasCoin == true && hasCoinFinal == true)
{
Greenfoot.setWorld(new SpaceLevel2());
}
if (canSee(PortalSpace2.class) && hasCoin == true && hasCoinFinal == true)
{
Greenfoot.setWorld(new SpaceLevel3());
}
if (canSee(PortalSpace3.class) && hasCoin == true && hasCoinFinal == true)
{
Greenfoot.setWorld(new EndScreen());
}
}
}
import greenfoot.*;
public class FloaterHill extends Platform
{
int frame = 0;
private int vSpeed = 0;
private int spriteHeight = getImage().getHeight();
private int spriteWidth = getImage().getWidth();
private int lookForGroundDistance = (int)spriteHeight/2;
private int lookForEdge = (int)spriteWidth/2;
private int speed = 1;
public void act()
{
checkEdge();
move(speed);
checkRightWalls();
checkLeftWalls();
}
public void checkEdge()
{
if(getX() < 10 || getX() > getWorld().getWidth() - 10) speed *= -1;
}
public void move()
{
Actor ground = getOneObjectAtOffset(lookForEdge, lookForGroundDistance, Platform.class);
if(ground == null) speed *= -1; else move(speed);
}
public boolean checkRightWalls()
{
int spriteWidth = getImage().getWidth();
int xDistance = (int)(spriteWidth/2);
Actor rightWall = getOneObjectAtOffset(xDistance, 0, Platform.class);
if(rightWall == null) return false;
stopByRightWall(rightWall);
return true;
}
public void stopByRightWall(Actor rightWall)
{
int wallWidth = rightWall.getImage().getWidth();
int newX = rightWall.getX() - (wallWidth + getImage().getWidth())/2;
setLocation(newX - 5, getY());
speed *= -1;
}
public boolean checkLeftWalls()
{
int spriteWidth = getImage().getWidth();
int xDistance = (int)(spriteWidth/-2);
Actor leftWall = getOneObjectAtOffset(xDistance, 0, Platform.class);
if(leftWall == null) return false;
stopByLeftWall(leftWall);
return true;
}
public void stopByLeftWall(Actor leftWall)
{
int wallWidth = leftWall.getImage().getWidth();
int newX = leftWall.getX() + (wallWidth + getImage().getWidth())/2;
setLocation(newX + 5, getY());
speed *= -1;
}
public boolean canSee(Class clss)
{
return getOneObjectAtOffset(0, 0, clss) != null;
}
}
